We should use them judiciously because-

a. They are an important source of fuels. Petroleum products like petrol, diesel etc. are used as fuel in automobiles. Coal is used in thermal power plants to generate electricity and also used as a fuel for domestic purposes.

b. They took millions of years to get formed hence if consumption will over exceeds it may lead to exhaustion of these resources.

c. We should use them judiciously so that our future generations can take benefits from them.

d. Burning of these fuels cause pollution, global warming so we should use them wisely.